TS4997IQT STMicroelectronics, TS4997IQT Datasheet - Page 25

• Manufacturer Part Number: TS4997IQT
• Description: IC AMP AUDIO 1W STER AB 16QFN
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4997IQT

• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 1W x 2 @ 8 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Features: 3D, Depop, Differential Inputs, Standby, Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5995-2

TS4997
4.8
4.9
T
Equation 7
Therefore, the maximum allowable value for T
If a 4-layer PCB with vias is used, R
value for T
Footprint recommendation
Footprint soldering pad dimensions are given in
previous section, the maximum allowable value for ambient temperature is dependent on
the thermal resistance junction to ambient R
power dissipation.
Based on best thermal performance, it is recommended to use 4-layer PCBs with vias to
effectively remove heat from the device. It is also recommended to use vias for 2-layer PCBs
to connect the package exposed pad to heatsink cooper areas placed on another layer.
For proper thermal conductivity, the vias must be plated through and solder-filled. Typical
thermal vias have the following dimensions: 1.2mm pitch, 0.3mm diameter.
Figure 65. QFN16 footprint recommendation
Decoupling of the circuit
Two capacitors are needed to correctly bypass the TS4997: a power supply bypass
capacitor C
amb
T
T
is calculated as follows:
amb
amb
= 150 - 85 x 2 x 1.266=42.4°C
= 150 - 45 x 2 x 1.266 = 93°C
amb
S
and a bias voltage bypass capacitor C
in this case is:
T
amb
=
150° C R
THJA
QFN16 = 45°C/W and the maximum allowable
–
THJA
TJHA
amb
Figure 72 on page
. Decreasing the R
×
is:
TotalP
b
.
dissmax
Application information
THJA
31. As discussed in the
value causes better
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